Stool



FIG. 1 is a top plan view of a stool showing one embodiment of my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a perspective view thereof;

FIG. 6 is a top plan view of a stool showing another embodiment of my new design;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a side elevation view thereof; and

FIG. 9 is a perspective view thereof. 

The ornamental design for a stool, as shown. 